Beginnings of a TCP driver
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#lang syndicate
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;;; SPDX-License-Identifier: LGPL-3.0-or-later
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;;; SPDX-FileCopyrightText: Copyright © 2021 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
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(require racket/tcp)
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(require syndicate/driver-support)
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(require syndicate/schemas/gen/tcp)
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(require syndicate/schemas/gen/dataspace-patterns)
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(define-logger syndicate/drivers/tcp)
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(define spawn-tcp-driver
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(action (ds)
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(spawn
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#:name 'tcp-driver
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#:daemon? #t
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(at ds
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(during/spawn
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(Observe (:pattern (Connection ,_ (TcpInbound ,(DLit $host) ,(DLit $port)))) _)
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#:name (TcpInbound host port)
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(run-listener this-turn ds host port))))))
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(define run-listener
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(action (ds host port)
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(on-start (log-syndicate/drivers/tcp-info "+listener on ~v ~v" host port))
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(on-stop (log-syndicate/drivers/tcp-info "-listener on ~v ~v" host port))
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(linked-thread
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#:name (list (TcpInbound host port) 'thread)
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this-turn
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(ref (entity #:name 'listen-monitor #:retract (action (_handle) (stop-current-facet))))
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(lambda ()
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(define listener (tcp-listen port 512 #t host))
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(let loop ()
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(define connection-custodian (make-custodian))
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(define-values (i o) (parameterize ((current-custodian connection-custodian))
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(tcp-accept listener)))
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(turn-freshen this-turn (action () (spawn-connection this-turn
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ds
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connection-custodian
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i
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o
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(TcpInbound host port))))
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(loop))))))
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(define spawn-connection
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(action (ds custodian i o spec)
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(define name (call-with-values (lambda () (tcp-addresses i #t)) list))
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(spawn
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#:name name
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(on-stop (close-input-port i)
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(close-output-port o))
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(define active-controller #f)
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(define active-controller-handle #f)
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(define flush-pending #f)
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(define start-thread
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(action ()
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(linked-thread
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#:name (list name 'input-thread)
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#:custodian custodian
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this-turn
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(ref (entity #:name (list name 'socket-monitor)
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#:retract (action (_handle) (stop-current-facet))))
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(lambda ()
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(let loop ()
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(define bs (read-bytes-avail i))
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(when (bytes? bs)
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(log-syndicate/drivers/tcp-info "inbound data ~v for ~v" bs this-actor)
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(turn-freshen this-turn (action () (send! active-controller (Socket bs))))
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(loop)))))))
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(define active-socket
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(ref (entity #:name (list name 'active-socket)
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#:assert
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(action (m handle)
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(match (parse-ActiveSocket m)
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[(ActiveSocket-controller controller)
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(log-syndicate/drivers/tcp-info "~v controller for ~v" controller this-actor)
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(when (not active-controller) (start-thread this-turn))
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(set! active-controller controller)
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(set! active-controller-handle handle)]
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[(ActiveSocket-close _)
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(log-syndicate/drivers/tcp-info "closing ~v" this-actor)
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(stop-current-facet)]))
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#:retract
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(action (handle)
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(log-syndicate/drivers/tcp-info "peer withdrawn ~v" this-actor)
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(when (equal? handle active-controller-handle)
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(stop-current-facet)))
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#:message
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(action (m)
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(match (parse-ActiveSocket m)
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[(ActiveSocket-Socket (Socket payload))
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(log-syndicate/drivers/tcp-info "outbound data ~v for ~v" payload this-actor)
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(write-bytes payload o)
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(when (not flush-pending)
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(set! flush-pending #t)
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(facet-on-end-of-turn! this-facet
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(action ()
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(set! flush-pending #f)
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(flush-output o))))])))))
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(at ds
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(assert (Connection active-socket spec))))))
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(define (read-bytes-avail input-port #:limit [limit 65536])
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(define buffer (make-bytes limit))
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(match (read-bytes-avail! buffer input-port)
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[(? number? count) (subbytes buffer 0 count)]
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[other other]))
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(module+ main
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(require syndicate/drivers/timer)
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(actor-system/dataspace (ds)
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(spawn-timer-driver this-turn ds)
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(spawn-tcp-driver this-turn ds)
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(spawn
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(at ds
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(during/spawn (Connection $conn (TcpInbound "0.0.0.0" 5999))
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(on-start (log-info "Starting service ~a" this-facet))
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(on-stop (log-info "Stopping service ~a" this-facet))
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(at conn
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(assert (ActiveSocket-controller
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(ref (entity #:message
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(action (m)
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(match (parse-Socket m)
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[(Socket #"bye\n")
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(log-info "Bye!")
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(stop-current-facet)]
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[(Socket data)
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(log-info "Echoing ~v" data)
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(send! conn (Socket data))]))))))))))))
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@ -0,0 +1,17 @@
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version 1 .
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embeddedType EntityRef.Ref .
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Connection = <connection @handle #!ActiveSocket @spec any>.
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ConnectionPeer = <connection-peer @handle #!ActiveSocket @spec any>.
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TcpOutbound = <outbound @host string @port int>.
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TcpInbound = <inbound @host string @port int>.
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ActiveSocket =
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/ <controller @controller #!Sink>
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/ <close @reason any>
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/ Socket
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.
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; TODO: <credit @amount int>
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Socket = <data @payload bytes>.
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